Addressing the recipient of a message as "Dear Sir" is a common and perfectly acceptable practice, even if you do not know the gender of the recipient.

Question

Quizplus · Accepted Answer

Using "Dear Sir" assumes the gender of the recipient, which can be incorrect and is not inclusive. It's better to use gender-neutral language like "Dear [Name]" if known, or "Dear Sir/Madam," "To Whom It May Concern," or simply "Dear [Title/Position]" if the recipient's name and gender are unknown.

Addressing the Recipient of a Message as "Dear Sir" Is